Jirachi vs Karsus: who would win?

Too close to call

Jirachi · Pokémon · Base

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Speed Of Light, up to Ftl

Durability

Multi-Continent Level

Karsus · Dungeons & Dragons · Archwizard of Netheril

Tier

HIGH 6-A, up to 2-A

Attack Potency

Multi-Continent Level, up to Multiverse Level+

Speed

Relativistic+, up to Infinite

Durability

Multi-Continent Level, up to Multiverse Level+

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.